I have had a mutual fund for many years. Each year it seems I am billed for some capital gains. If I sell this fund today, how do I know if I have any additional capital gains on this fund?
There are two entirely different types of capital gains. where mutual funds are concerned. The one you can receive annually is gain that result from the fund manager selling stocks within the portfolio. Those gains are paid out to you annually and do not affect your cost basis in the fund.
The second type is the capital gain you can realize when you sell the fund shares. That gain is determined by the difference between the price at which you purchased your fund shares and the price of the fund shares when you sell.
Comment from Stinkerbellkity appears to be correct. I will only add that because you say that you held the fund for over a year, then any gain should be a long-term gain. Your brokerage should give you a 1099-B indicating your sale as long term. In addition, your 1099-B will indicate whether the basis was reported, or was not reported, to the IRS. The information on your 1099-B will be used in Form 8949 and Schedule D. TurboTax will guide you through the process and complete the forms for you.